BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.

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History

Wed, 06 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 06 May 2026 13:30:00 +0000

Type Values Removed Values Added
References

Wed, 06 May 2026 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Vda-linux
Vda-linux busybox Mirror
Vendors & Products Vda-linux
Vda-linux busybox Mirror

Mon, 04 May 2026 18:15:00 +0000

Type Values Removed Values Added
Description BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.
Title BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS
Weaknesses CWE-122
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'}

cvssV4_0

{'score': 7.2, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-05-06T13:46:42.699Z

Reserved: 2026-03-03T16:42:01.012Z

Link: CVE-2026-29004

cve-icon Vulnrichment

Updated: 2026-05-06T13:46:35.554Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-04T18:16:26.523

Modified: 2026-05-06T14:16:07.860

Link: CVE-2026-29004

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-06T09:22:43Z

Weaknesses